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Board space can be saved by using the LTC1045 level translator as a hex comparator—even though both comparator inputs are not available. 4 shows the LTC1045 used as a power supply monitor. The outputs of three power supplies are tied to the positive inputs through an appropriate resistive voltage divider. The divider ratio is set so that the voltage into the comparator equals the reference on the inverting input when the power supply voltage is at a critical level.

Let’s look at some numbers to see how this works. 5V output capable of delivering 15A to the load, with a ±6% (±90mV) transient window. For the first case, consider a classic converter with perfect DC regulation. Use a 10A load step with a slew rate of 100A/μs. The initial voltage spike will be determined solely by the output capacitor’s equivalent series resistance (ESR) and inductance (ESL). 75mΩ and an ESL = 375pH. 75mΩ · 10A) + (375pH · 100A/μs) = 75mV. This leaves a 1% margin for set point accuracy.

1 • SMBus Fan Speed Controller enable an optional boost feature that eliminates fan start-up problems by outputting 5V to the fan for 250ms before lowering the output voltage to its programmed value. Another important feature is that the system controller can read overcurrent and overtemperature fault conditions from information stored in the LTC1695. The part’s SMBus address is hard-wired internally as 1110 100 (MSB to LSB, A6 to A0) and the data code bits D0 to D6 are latched at the falling edge of the SMBus Data Acknowledge signal (D6 is a BoostStart Enable bit and D5 to D0 translate to a linearly proportional output voltage, 00 – 3F hex = 0V – 5V).